Lightning-arrester



(No Model.)

W. LB YR. EMMET. LIGHTNING ARRESTBR.

vatentedlug. 22, 1893.

ZZZQ @5665,

UNITED STATES PATENT OFFICE.

n VILLlAM LE ROY EMMET, OF CHICAGO, ILLINOIS.

LIGHTNING-Austern.

SPECIFICATION forming part of Letters Patent No. 503,788, dated August 22, 1893.

y Application filed July 11,1892. seni No. 439.626.' (remodel.)

Toa/ZZ whom/ it 'may concern:

v Be it known that l, WILLIAM LE ROY EM- MET, a citizen of the United States, residing at Chicago, lllinois, have invented certain new `fand useful Improvements in Lightning Ar- Vresters, of whichthe following is a specification. v

Thfeobject of my invention is to provide a multiple fuse lightning arrester for use on i IO,

electric circuits, and it is intended to aiord several paths of discharge for a shock of lightning, and means by Which the circuit `may resume its normal electric condition aff terit has been disturbed by such a discharge;

and my invention consists in the featu res and details of construction hereinafter` described and claimed.

Inthe drawings, Figure l is a front View of my invention, with the cover removed. Fig. 2 is a bottom View, with the cover in place. Fig. 3 is a sectional elevation on line 3 or" Fig; 2, looking in the direction of thearrows; and Figs. 4 and 5 are details of construction hereinafter described.

.The receptacle or box A is preferably made 1 yof Wood7 rectangular in shape, with projecting end pieces, a, on the base, for securing it to the wall or other desired place, the lower side being left open, thus aiording a' means forvthe ready insertion or removal of the ar rester proper. The cover, of, is secured to the main portion'in anyy convenientmanuer, and is provided with rectangular apertures, a2, extendingin the direction of itslength, (as shown by dotted lines in Fig. l) thus aord ing an casi7 method for the escape ofgases after-the fuse blowsand the hinged leather liaps, a3, vprotect these apertures )from the weather,.while permitting a free circulation of air: -Tl1e terminals, B and B', are provided with grooved rails, which receive and make electrical contact withthe flanges of the metallic pieces, b, b', on the arrester proper.

The arrester proper consists of a board or other insulating material, C, on which is mounted at one end aset of two or more electrodes, d, which are connected electrically by a metallic'clamp, b, and are connected with a line wire terminal by its ange, b2. These electrodes; prefer to make of carbon. Mounted independently on the board C, and opposite the electrodes d, is another set of electrodes, E, secured in such a manner that the space between each pairof electrodes may be 4regulatedat will. To the opposite'end of the board C is secured a metal piece, b', provided with a flange, b3, tofit a corresponding groove in the ground terminal B. This metallic piece has a series of lugs, F, in line with, and corresponding in number t0,the electrodes,

and are provided with slots f', through which and around the lugs are fastened several fine metallic wires G. The opposite ends being secured around the hooks e, serve to make electrical connection lbetween the electrodes E and the ground terminal.

To isolate the fuse wires from eacli other' and other parts of the arrester, the piece C has a series of grooves, corresponding in num'- ber'to the fuse wires, with strips of insulating material, H and H at each Aend of the said grooves, and slotted to permit thefpassage of the fine fuse wires. This arrangement serves'to protect each compartment and air space, between each -pair of electrodes, fronrthe' dame or gases consequent to the blowing of a fuse, and the apertures in the coveraiordan easy means for the gases to escape to the outer air. v

. The air space between the electrodes D and E, is sucient 13o/prevent the normal electric pressure from causing the passage of current through the arrester to the ground, and the distance between the metallic piece b and IOO dition. The lightning will, in nearly every instance, take one only of the several paths of discharge aiorded it, and it will readily be seen that the arrester will dispose of as many shocks of lightning as there are fuse wines. When one or all of the fuse wires are blown,

the arrester can be readily removed from its receptacle and re-adjusted, or another one inserted.

While l have entered into a more or less minute description as to the details of my invention, I do not desire to be limited thereto undulv any more than is pointed out in the claims; on the contrary, I contemplate changes in form, construction and arrangement and the use of equivalents, as occasion may warrant or necessity render expedient.

l claiml l. As an improvement in lightning arresters, the combination of a main portion containing a single pair of terminal connections for line and ground, forming a receptacle and protection for the arrester proper andadapted to isolate the fuse chambers in the arrester proper from each other and the electrodes, and the arrester proper containing several sets of electrodes and fuse wires, adapted to be easily inserted or removed from the receptacle, the whole offering several paths of discharge for one shock ot lightning, substantially as described.

- 2. As an improvement in lightning arresters, an arrester proper composed of several pairs of `electrodes 'one set of which are connected together electrically, and with a linewire terminal, and the opposite set indepcnd ently connectedwith the ground contact piece, the individual connections between the electrodes and the ground contact being contained in separate compartments of insulating material, forming part of the arrester proper, and which serves t0 protect each from the action of the other, substantially as de scribed.

8. As an improvement in lightning arresters, the combination of a main portion containing a single pair of terminal connections for line and ground, and forming areceptacle and protector for the arrester proper, and an arrester proper composedlot several pairs of electrodes, one set of which are connected together electrically and with the line wire contact piece, and the' opposite set independentl y connected with the ground contact piece, individua-l fuse connections between the electrodes and the ground contact, and contained in separate compartments of insulating material, forming part of the arrester proper, and which serves to protect each fuse from `the action of the other, substantially as described.

4. As an improvement in lightning arresters, the combinationA of a main portion containing the terminal connections with the line and ground wires, and forming a receptacle tor the arrester proper, the arrester proper adapted to be easily inserted or rcmoved therefrom, and composed of two or more pairs ot electrodes, one set ot which are connected together electrically and connected with the normal electric circuit, and a series ofline metallic wires, connecting the opposite of electrodes independently with the ground, substantially as described.

5. As an improvement in lightning arresters, the combination of a main portion containing a single pair of terminal connections for line and ground, and forminga receptacle for the arrester proper, and adapted to isolate the fuse chambers in the arrester proper from each other, apertures in the cover ex-v tending in line with and adjacent to the fuse chambers, hinged aps protecting the apera tures, and an arrester proper provided with several fuse chambers, substantially as described.

6. As an improvement in lightning arresters, the combination of terminals B, B with 'their grooved rails, a metallic contact piece b form-ing the electrical connection between 'one set of the electrodes, the flange b2 for contacting the line wire terminal, the metallic contact piece b', with its flanges b3, and the series of fuse wires G connecting the other set of electrodes with the contact piece b', the whole forming several arresters between a single pair of contact iianges, substantially as described.

7. Asian improvement in lightning arresters, the combination of a single pair of terminals for line and ground, a single pair of contact flanges adapted to engage the same, two or more arresters between and adapted to electrically connect the contact anges, substantially as described.

VILLIAM LE ROY EMMET.

Witnesses EPHRAIM BANNING, THos. F. SHERIDAN.

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